TY  - RPRT
TI  - Adaptation to level of difficulty in intelligence testing.
AU  - A W HEIM
PY  - 1955
DO  - 10.1111/j.2044-8295.1955.tb00541.x
UR  - https://pubmed.ncbi.nlm.nih.gov/13250159/
ID  - 13250159
ER  -